Tom Hanks is back as The Da Vinci Code‘s Robert Langdon, and it’s up to him to save the world once again. Sony Pictures Entertainment dropped a new teaser trailer for Inferno on Monday, showing the symbologist-slash-hero’s latest hellacious task.

The trailer doesn’t waste any time in showing how high the stakes are for Langdon, not to mention humanity in general. “There is a switch,” we hear. “If you throw it, half the people on earth will die, but if you don’t, in 100 years, the human race will be extinct.”

As it turns out, someone has created a terrifying plague. All hope isn’t lost yet, though, because the evil mastermind has also oh-so-kindly left a path for Langdon to stop it. However, it’s “the hardest one yet,” according to the man. “Only you can finish it. You are humanity’s final hope.”

Obviously, that’s a lot of pressure on Langdon, but he’ll have help from Dr. Sienna Brooks (played by Felicity Jones). The trailer shows the two of them puzzling over a clue, which as it turns out is Dante’s Inferno. The duo needs to determine why they’ve been left a map of hell, how to find the virus, and how to prevent the horrors to come.

On top of all the challenges shown in the trailer, the film’s official synopsis reveals that Langdon will be battling amnesia — at least initially. Dr. Brooks’ involvement is apparently to help him restore his memory, but she gets swept up in the chaos that ensues. Inferno is based on Dan Brown’s novel of the same name, which is the third in the Da Vinci Code series.

The screenplay was written by acclaimed screenwriter David Koepp, and Oscar winner Ron Howard serves as director. Inferno is slated to hit theaters on October 28.